Facile Grafting of Imidazolium Salt in Covalent Organic Frameworks with Enhanced Catalytic Activity for CO2 Fixation and the Knoevenagel Reaction

2020 ◽  
Vol 8 (50) ◽  
pp. 18413-18419
Author(s):  
Yuling Zhao ◽  
Yue Zhao ◽  
Jikuan Qiu ◽  
Zhiyong Li ◽  
Huiyong Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co2 Fixation ◽  
Knoevenagel Reaction ◽  
Covalent Organic Frameworks ◽  
Imidazolium Salt

Hydrazone-based covalent organic frameworks for Lewis acid catalysis

2018 ◽  
Vol 47 (39) ◽  
pp. 13824-13829 ◽  
Author(s):  
Tanay Kundu ◽  
Jian Wang ◽  
Youdong Cheng ◽  
Yonghua Du ◽  
Yuhong Qian ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Covalent Organic Frameworks ◽  
Lewis Acid Catalysis

Two new hydroxy-rich hydrazone COFs are synthesized and postsynthetically incorporated with CoII to exhibit Lewis acid catalytic activity in cyanosilylation reactions of various aldehydes.

Niobium(v) chloride and imidazolium bromides as efficient dual catalyst systems for the cycloaddition of carbon dioxide and propylene oxide

2014 ◽  
Vol 4 (6) ◽  
pp. 1638-1643 ◽  
Author(s):  
Michael E. Wilhelm ◽  
Michael H. Anthofer ◽  
Robert M. Reich ◽  
Valerio D'Elia ◽  
Jean-Marie Basset ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Propylene Oxide ◽  
Catalyst System ◽  
Cyclic Carbonates ◽  
Imidazolium Salt ◽  
Catalyst Systems

Imidazolium bromides combined with niobium(v) choride were used as catalyst system for the reaction of CO2 with epoxides to cyclic carbonates. The variation of the cation structure strongly affects the properties of the imidazolium salt and therefore the catalytic activity.

scholarly journals An efficient Pd–NHC catalyst system in situ generated from Na2PdCl4 and PEG-functionalized imidazolium salts for Mizoroki–Heck reactions in water

2017 ◽  
Vol 13 ◽  
pp. 1735-1744 ◽  
Author(s):  
Nan Sun ◽  
Meng Chen ◽  
Liqun Jin ◽  
Wei Zhao ◽  
Baoxiang Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Imidazole Ring ◽  
Catalyst System ◽  
Water Soluble ◽  
Imidazolium Salts ◽  
Heck Reactions ◽  
Imidazolium Salt ◽  
Simple Method ◽  
Wide Range

Three PEG-functionalized imidazolium salts L1–L3 were designed and prepared from commercially available materials via a simple method. Their corresponding water soluble Pd–NHC catalysts, in situ generated from the imidazolium salts L1–L3 and Na2PdCl4 in water, showed impressive catalytic activity for aqueous Mizoroki–Heck reactions. The kinetic study revealed that the Pd catalyst derived from the imidazolium salt L1, bearing a pyridine-2-methyl substituent at the N3 atom of the imidazole ring, showed the best catalytic activity. Under the optimal conditions, a wide range of substituted alkenes were achieved in good to excellent yields from various aryl bromides and alkenes with the catalyst TON of up to 10,000.

scholarly journals Coupled inter-subunit dynamics enable the fastest CO2-fixation by reductive carboxylases

2019 ◽  
Author(s):  
Hasan DeMirci ◽  
Yash Rao ◽  
Gabriele M. Stoffel ◽  
Bastian Vögeli ◽  
Kristina Schell ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Molecular Mechanisms ◽  
Co2 Fixation ◽  
Catalytic Domains ◽  
Catalytically Active ◽  
Key Enzyme ◽  
Order Of Magnitude ◽  
Conformational Coupling ◽  
Substrate Binding Sites ◽  
Half Site

AbstractEnoyl-CoA carboxylases/reductases (ECRs) are the most efficient CO2-fixing enzymes described to date, outcompeting RubisCO, the key enzyme in photosynthesis in catalytic activity by more than an order of magnitude. However, the molecular mechanisms underlying ECR’s extraordinary catalytic activity remain elusive. Here we used different crystallographic approaches, including ambient temperature X-ray Free Electron Laser (XFEL) experiments, to study the dynamic structural organization of the ECR from Kitasatospora setae. K. setae ECR is a homotetramer that differentiates into a dimer of dimers of open- and closed-form subunits in the catalytically active state, suggesting that the enzyme operates with “half-site reactivity” to achieve high catalytic rates. Using structure-based mutagenesis, we show that catalysis is synchronized in K. setae ECR across the pair of dimers by conformational coupling of catalytic domains and within individual dimers by shared substrate binding sites. Our results provide unprecedented insights into the dynamic organization and synchronized inter- and intra-subunit communications of nature’s most efficient CO2-fixing enzyme during catalysis.

scholarly journals Fe-doped H3PMo12O40 immobilized on covalent organic frameworks (Fe/PMA@COFs): a heterogeneous catalyst for the epoxidation of cyclooctene with H2O2

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 4884-4891 ◽  
Author(s):  
Dandan Yu ◽  
Wenxiu Gao ◽  
Shuyu Xing ◽  
Lili Lian ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nitrogen Content ◽  
Heterogeneous Catalyst ◽  
Spatial Configuration ◽  
Covalent Organic Frameworks

Fe/PMA@COF composites for the epoxidation of cyclooctene: the spatial configuration and nitrogen content of the COF support significantly influence the catalytic activity and stability.

An efficient CO2 fixation reaction with epoxides catalysed by in situ formed blue vanadium catalyst from dioxovanadium(+5) complex: moisture enhanced and atmospheric oxygen retarded catalytic activity

2020 ◽  
Vol 44 (6) ◽  
pp. 2547-2554 ◽  
Author(s):  
Rakhimoni Borah ◽  
Naranarayan Deori ◽  
Sanfaori Brahma
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Co2 Fixation ◽  
Atmospheric Oxygen ◽  
Carbon Dioxide Fixation ◽  
Vanadium Catalyst ◽  
Cyclic Carbonates ◽  
Mild Conditions ◽  
Fixation Reaction

In situ formed vanadium(+4) species catalyzed carbon dioxide fixation reaction, leading to 99% conversion of epoxides to cyclic carbonates under mild conditions is reported here, along with the study on the in situ formed catalyst to some extent.

New lanthanide(iii) coordination polymers: synthesis, structural features, and catalytic activity in CO2 fixation

2017 ◽  
Vol 46 (47) ◽  
pp. 16426-16431 ◽  
Author(s):  
Cong Xu ◽  
Yan Liu ◽  
Li Wang ◽  
Jingxin Ma ◽  
Lizi Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Coordination Polymers ◽  
Co2 Fixation ◽  
Structural Features ◽  
Cycloaddition Reactions ◽  
Heterogeneous Catalytic

A series of Ln-CPs show highly heterogeneous catalytic activity for cycloaddition reactions with TON = 3920 and TOF = 326 h−1.

Porous noria polymer: a cage-to-network approach toward a robust catalyst for CO2 fixation and nitroarene reduction

2021 ◽  
Author(s):  
Arkaprabha Giri ◽  
Niraj Nitish Patil ◽  
Abhijit Patra
Keyword(s):  
Catalytic Activity ◽  
Co2 Fixation ◽  
Organic Polymers ◽  
Network Approach ◽  
Porous Organic Polymers ◽  
Nitroarene Reduction

A ‘preporous’ waterwheel-like molecular cage, noria, was knitted with rigid aromatic linkers to obtain porous organic polymers exhibiting excellent catalytic activity toward CO2 fixation and nitroarene reduction.

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